i had almost the same issue in my d15b about 2 years ago. it was not responsive as it used to be and at times it would start jerking when i'd press the accelerator. Two of the electricians i consulted could not find what the problem was because plugs, wires, injectors, fuel pump, distributor and everything was fine. and so one of them took me to a guy at some other workshop, this guy had a book of some codes written in it and he connected the wires with the ECU, he actually resolved the issue through ecu settings. and btw it took him only 15mins to fix it.
consult a competent electrician in your area, he should be able to resolve the issue. let us know